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Old 03-13-2008, 06:01 PM   #16
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Vent stack for kitchen sink


trying to wrap my head around this one!! Why would two traps cause a problem? One trap on the disposal sink bowl,,,then another downstream that BOTH bowls ran thru before it exits thru the wall?? How else do you keep the disposal from throwing dirty water and food back out of the other bowl??

I guess I am ONLY a DIY'er from way back but common sense needs SOME portion of decisions. So EACH bowl needs its own trap and then wyed together to run out the wall?? Do traps plug up 'easier one after another??

Nobody EVER accused me of being TOO smart, but explain in dummy 101 words!!

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Old 03-13-2008, 06:02 PM   #17
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Vent stack for kitchen sink


Justdon,

first make sure the tee that the garbage disposal connects to has a baffle. This is a piece inside the tee that will direct the garbage disposal discharge downward into the trap. Here we never use two traps (one for each bowl). Its always an end outlet continuous waste. Not sure of the code requirements in your area.
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Old 03-13-2008, 07:56 PM   #18
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Vent stack for kitchen sink


I'm not a pro plumber like Ron, but I believe that your setup in the photo has to have a single trap under the floor and is "vented" by the air admittance valve (aka AAV or "studor" vent) shown in the photo. That's why it is working so well. It wouldn't have passed the original inspection otherwise, either. AAVs must be permitted by your local code.
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Old 03-16-2008, 01:44 AM   #19
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Vent stack for kitchen sink


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Originally Posted by Mike Swearingen View Post
I'm not a pro plumber like Ron, but I believe that your setup in the photo has to have a single trap under the floor and is "vented" by the air admittance valve (aka AAV or "studor" vent) shown in the photo. That's why it is working so well. It wouldn't have passed the original inspection otherwise, either. AAVs must be permitted by your local code.
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What AAV? One pipe leads to the disposer, the other to the second bowl in the sink. The part of the basket strainer visible in the photo is white plastic. Is that what you're calling the AAV? (The one on the left.)
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Old 03-16-2008, 05:50 PM   #20
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Vent stack for kitchen sink


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Originally Posted by Double A View Post
First of all, understand this. Codes are written to ensure safety and functionality first and foremost. Sometimes the code makes sense to anyone that reads it, sometimes it makes little sense and seems inconvenient. That is when we get situations like your's and your daughters plumbing issues.

Most model codes call for a separate trap for a disposer for just this reason. The disposer can push dirty water into the other bowl of the sink where there might be clean food or dishes and contaminate them.

Its not a likely situation, but codes look more at possibilities, not really probabilities. Some local code officials think this such a low probability that they give in to pressure to exempt or cut out this section of the code for single family dwellings, but may still require it for churches, schools, day cares, etc.

The setup you're seeing in your daughter's home is called a continuous end-outlet waste. Its designed for two sink bowls to share a trap. I don't know what your local code calls for, but after one year, I wouldn't think the builder/plumber would have any responsibility to make corrections now.

Continuous end-outlet waste


Take a picture and start a new thread. We can tell you how to add a second trap to the disposer if you want to tackle it. If not, its usually not a lot of bother for a good plumber to change it over.

Or you can check out Kirby Palm's page on a disposer installation he did. Really good drawings and a nice picture of a disposer on its own trap. He's made the sink drain on one bowl a bit more complicated than need be, but nice work for a DIYer. His installation didn't include a dishwasher drain.
It looks by the picture that the disposer and the other sink outlet are too close together to use the above pictured end outlet, which may be why they did it the way they did it.... regardless... no trap, double trapping, trap below floor are all against code........ Certain sinks need a smaller tee to accomodate both draining into the same trap. Disposer does not have to be separately trapped here, at least not residentially...

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